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DEFINING THE PRINTER TO THE HOST: TCP/IP ATTACHMENT
E-12 XEROX DOCUPRINT 96/4635/180 IPS INSTALLATION PLANNING GUIDE
Considerations for configuring TCP/IP
for MVS
Following are some considerations for configuring TCP/IP for MVS:
• To specify a TCP/IP address space name other than the default,
TCPIP, code the following EXEC statement in the appropriate
PSF writer procedure:
STEP01 EXEC PGM=APSPPIEP,
PARM=(,,,,tcpip_name), REGION=4096K
where tcp/ip_name is the name of the TCP/IP address space.
If this parameter is not coded, PSF uses the default name,
TCPIP. (For a full description of the PARM parameter, refer to
Print Services Facility/MVS: Diagnosis Guide and Reference.)
• KEEPALIVEOPTIONS statement: PSF relies on TCP to
detect when a connection with the IPS printer is no longer
usable. When no data has been exchanged between PSF and
its connection partner, TCP sends keep-alive probes to the
connection partner periodically. These periodic probes, called
keep-alive transmissions, enable TCP to discover when a
Table E-7.TCP/IP Profile dataset parameters – MVS
Item description Default
Source of
value
Range of
acceptable values Comments Your value
DATABUFFERPOOLSIZE
Data buffers
160 Installation
preferences
7 to nnnn, where
nnnn is limited by
available virtual
storage
Specify at least 160
buffers.
DATABUFFERPOOLSIZE
Buffer size
16384 Installation
preferences
8192 49152
12288 65536
16384 98304
24576 131072
28672 196608
32768 262144
Specify a buffer size of
at least 32768, if
possible.
SMALLDATABUFFERPOOLSIZE 0 Installation
preferences
0 to nnnn, where
nnnn is limited by
available virtual
storage
Specify at least 256
small data buffers.
TINYDATABUFFERPOOLSIZE 0 Installation
preferences
0 to nnnn, where
nnnn is limited by
available virtual
storage
Specify at least 256 tiny
data buffers.
KEEPALIVEOPTIONS Interval 120
sendgarbage
false
Installation
preferences
See Notes.
GATEWAY max_packet_size Defaultsize is
576
Installation
preferences
Can be from 576 to
67108864, but
cannot be larger
than value specified
on LARGEENVE
LOPEPOOLSIZE
statement.
Max packet size
parameter should be no
greater than 4472 bytes
in a 4 Mbps LAN
configuration, and
17800 in a 16 Mbps
LAN configuration.
Default MTU value in
IPS printer is 2052.